The formats of the individual distribution reports vary in some details but broadly include a summary page, followed by further pages which give method related statistics for each sample and analyte, and a cumulative performance table. The presentation of the reports and the associated computer programs are under continual review and refinement and will change with time.

The Variance Index Scoring System is used for data analysis in those programmes that have a quantitative element and a numeric result.

In those programmes which have an interepretative element or a qualitative response the Misclassification Index Scoring system is used.